Chem

25.1 Multiple-Choice and Bimodal Questions

1) Hydrocarbons containing only single bonds between the carbon atoms are called __________.

A) alkenes

B) alkynes

C) aromatics

D) alkanes

E) ketones

Answer: D

Diff: 1

Page Ref: Sec. 25.2

2) What general class of compounds is also known as olefins?

A) alkenes

B) alkynes

C) aromatics

D) alkanes

E) ketones

Answer: A

Diff: 1

Page Ref: Sec. 25.2

3) The simplest alkyne is __________.

A) ethylene

B) ethane

C) acetylene

D) propyne

E) benzene

Answer: C

Diff: 1

Page Ref: Sec. 25.2

4) The melting and boiling points of hydrocarbons are determined by __________.

A) ion-dipole attraction

B) dipole-dipole attraction

C) London forces

D) hydrogen bonding

E) ionic bonding

Answer: C

Diff: 1

Page Ref: Sec. 25.2

5) Hydrocarbons containing carbon-carbon triple bonds are called __________.

A) alkanes

B) aromatic hydrocarbons

C) alkynes

D) alkenes

E) olefins

Answer: C

Diff: 1

Page Ref: Sec. 25.2

6) Alkynes always contain a __________.

A)[pic]

B) C≡C bond

C) C-C bond

D) C-H bond

E) C≡H bond

Answer: B

Diff: 1

Page Ref: Sec. 25.2

7) Alkenes always contain a __________.

A)[pic]

B) C≡C bond

C) C-C bond

D)[pic]

E) C≡H bond

Answer: A

Diff: 1

Page Ref: Sec. 25.2

8) Hybridization of the carbon atom indicated by (*) in [pic], [pic] , and [pic] is __________, __________, and __________, respectively.

A) [pic]

B) [pic]

C) [pic]

D) [pic]

E) [pic]

Answer: A

Diff: 2

Page Ref: Sec. 25.2

9) The molecular geometry of each carbon atom in an alkane is __________.

A) octahedral

B) square planar

C) trigonal planar

D) tetrahedral

E) trigonal pyramidal

Answer: D

Diff: 1

Page Ref: Sec. 25.3

10) The minimum number of carbons necessary for a hydrocarbon to form a branched structure is __________.

A) 4

B) 6

C) 3

D) 9

E) 12

Answer: A

Diff: 1

Page Ref: Sec. 25.3

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